noun, plural fo·cus·es, fo·ci [foh-sahy, -kahy] /ˈfoʊ saɪ, -kaɪ/.
- the focal point of a lens, on which rays converge or from which they deviate.
- the focal length of a lens; the distance from a focal point to a corresponding principal plane.
- the clear and sharply defined condition of an image.
- the position of a viewed object or the adjustment of an optical device necessary to produce a clear image: in focus; out of focus.
verb (used with object), fo·cused, fo·cus·ing or (especially British) fo·cussed, fo·cus·sing.
verb (used without object), fo·cused, fo·cus·ing or (especially British) fo·cussed, fo·cus·sing.
- foch, ferdinand,
- focus group,
- focus puller,
- focused strategy,
- focusing cloth
Origin of focus
Examples from the Web for focussing
Sure, focussing on wellbeing over whimsy is okay sometimes, but it can't be our only option in a market with so much scope.
The lens is surrounded by a metal case or lantern, in which is placed the electric lamp upon a slide for focussing.Torpedoes and Torpedo Warfare|C. W. Sleeman
The greatest care should be taken in focussing the telescope.Half-hours with the Telescope|Richard A. Proctor
So, strong colours are equally useful in focussing the shadows, or in giving them variety.The Use of a Box of Colours|Harry Willson
"I shall take good care of him," said Mrs. Berry, focussing her eyes to the comprehension of the company.The Ordeal of Richard Feverel, Complete|George Meredith
He was focussing his glass a little more closely on the goat standing watchfully on its crag, when Otto spoke again.The Grizzly King|James Oliver Curwood
noun plural -cuses or -ci (-saɪ, -kaɪ, -kiː)
verb -cuses, -cusing, -cused, -cusses, -cussing or -cussed
Word Origin for focus
1640s, from Latin focus "hearth, fireplace" (also, figuratively, "home, family"), of unknown origin, used in post-classical times for "fire" itself, taken by Kepler (1604) in a mathematical sense for "point of convergence," perhaps on analogy of the burning point of a lens (the purely optical sense of the word may have existed before Kepler, but it is not recorded). Introduced into English 1650s by Hobbes. Sense transfer to "center of activity or energy" is first recorded 1796.
1775 in the literal sense; 1807 in the figurative sense, from focus (n.). Related: Focused; focusing; less commonly focussed; focussing.